APA (7th ed.) Citation

Royal Horticultural Society (Great Britain), Kew. Royal Gardens, Worsdell, W. C., & Hill, A. W. (1941). Index londinensis to illustrations of flowering plants, ferns and fern allies.: Supplement for the years 1921-35. Clarendon press.

Chicago Style (17th ed.) Citation

Royal Horticultural Society (Great Britain), Kew. Royal Gardens, Wilson Crosfield Worsdell, and Arthur W. Hill. Index Londinensis to Illustrations of Flowering Plants, Ferns and Fern Allies.: Supplement for the Years 1921-35. Oxford: Clarendon press, 1941.

MLA (9th ed.) Citation

Royal Horticultural Society (Great Britain), et al. Index Londinensis to Illustrations of Flowering Plants, Ferns and Fern Allies.: Supplement for the Years 1921-35. Clarendon press, 1941.